Enhancing potential field data using filters based on the local phase

Cooper, G.R.J.; Cowan, Duncan

doi:10.1016/j.cageo.2006.02.016

Cited by 408 publications

(174 citation statements)

References 11 publications

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“…In Figure 1 we compare three filters, namely the total horizontal derivative (THDR, Cordell and Grauch, 1985), the normalized maximum horizontal gradient amplitude (TDX, Cooper and Cowan, 2006), and the tilt angle of the total horizontal gradient (TAHG, Ferreira et al, 2013), with the Signum transforms of the first and the second vertical derivative. We use a model composed of two dykes with a = 100 m (for both), and h = 100 m (left) and h = 500 m (right).…”

Section: Resultsmentioning

confidence: 99%

“…In recent years several such methods have been described which involve equalising the amplitudes of magnetic anomalies, by normalizing the derivatives of the field. For instances, the tilt derivative (Miller and Singh, 1994;Verduzco et al, 2004), the Theta map (Wijns et al, 2005) and the horizontal tilt derivative (TDX) (Cooper and Cowan, 2006). Recently, de Souza and Ferreira (2012) proposed a simple derivative-based method for qualitative and quantitative interpretation of magnetic anomalies from dykelike structures.…”

Section: Introductionmentioning

confidence: 99%

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The application of the Signum transform to the interpretation of magnetic anomalies due to prismatic bodies

Souza

2015

ASEG Extended Abstracts

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The application of the Signum transform to the interpretation of magnetic anomalies due to prismatic bodies

Souza

2015

ASEG Extended Abstracts

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“…7(d) is simulated based on a 0.1 km regular grid, and the gradients of the synthetic model are derived according to the formulas that were proposed by Cooper (2006). We calculate the eigenvector v 1 , and then delineate the source centroids and outlines (Fig.…”

Section: Synthetic Experimentsmentioning

confidence: 99%

“…data interpretation (Gordell 1989;Wijns et. al., 2005;Li 2006;Cooper and Cowan 2006;Foks 2013;Ma and Li 2012;Phillips 2015;).…”

Section: Introductionmentioning

confidence: 99%

Full-tensor gravity gradient eigenvector analysis for locating complex geological source positions

Zuo

Kass

Geng

2017

Preprint

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Abstract.We develop an eigenvector analysis method to locate the centroids and horizontal boundaries of geological 10 structures of full tensor gravity gradient (GGT) data. Although the boundary detection method for Bouguer gravity has been widely discussed and applied, the source location method for GGT data remains an area of active research. In this paper, we first discuss the theoretical basis and physical meaning of the eigenvector analysis on GGT data, and then a new source location method is derived. Unlike traditional potential field boundary detection, the proposed method uses eigenvector analysis to extract the source centroid information. The interference of multiple and overlapping sources and the parameter 15 identification related with the multiple scales of the GGT eigenvector analysis are presented in the theoretical and experimental sections. Finally, the proposed method is applied to synthetic and field data.

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“…3A). Tilt angle responses vary between positive values over the source, zero over or near the edge, and negative values outside the body (Cooper & Cowan, 2006). This sign variation is particularly useful when attempting to detect the relative contrast in magnetisation.…”

Section: New High-resolution Aeromagnetic Datamentioning

confidence: 99%

Multiphase mafic dykes in the Caledonides of northern Finnmark revealed by a new high-resolution aeromagnetic dataset

Nasuti¹,

Roberts²,

Gernigon³

2015

NJG

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New high-resolution aeromagnetic data from northern Finnmark provide confirmatory evidence for the existence of both metadolerite and unmetamorphosed dolerite dykes transecting the Caledonian nappes and subjacent (par)autochthonous lithostratigraphical successions from Magerøya in the west to Varanger Peninsula in the east. Three ages of mafic dykes are known from isotopic dating studies -Ediacaran, Late Devonian and Early Carboniferous -but actual dyke outcrop in the case of the two younger dyke sets is very limited. High-amplitude magnetic responses in two thrust sheets in northwestern Varanger Peninsula, north of the TKFZ and beneath the Tanahorn Nappe, are clearly shown to relate to swarms of Ediacaran metadolerite dykes. Individual dykes discontinuously exposed on the surface can be followed as linear positive magnetic anomalies over distances of 25 km inland. Their extent offshore is not discussed here because it is beyond our data coverage in this paper. In eastern Varanger Peninsula, 8-9 dolerite dykes of Late Devonian age occur in discontinuous or limited outcrop. The new aeromagnetic data show, however, that up to 20 such dykes can be identified in the subsurface in the region between Vardø and Syltefjorden based on their linear positive magnetic anomaly signatures. South of the TKFZ, two Late Devonian dolerite dykes, well known from small coastal outcrops, are clearly visible as linear positive magnetic anomalies both on land and offshore beneath the sea-floor of Varangerfjorden. The most spectacular manifestations of what we consider to represent blind dolerite dykes are seen in connection with linear positive magnetic anomalies relating to Early Carboniferous dolerite dykes exposed on Magerøya and western Digermul Peninsula. These prominent linear anomalies follow many of the mapped NW-SE-to WNW-ESE-trending faults that have disrupted the Caledonian nappes in this part of Finnmark, and some are continuous over distances of more than 100 km from Magerøya to western Varanger Peninsula. These particular dykes and faults have been interpreted as relating to a major period of extension and rifting that occurred in the SW Barents Sea and adjacent onshore areas of Norway in Carboniferous time.

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Enhancing potential field data using filters based on the local phase

Cited by 408 publications

References 11 publications

The application of the Signum transform to the interpretation of magnetic anomalies due to prismatic bodies

The application of the Signum transform to the interpretation of magnetic anomalies due to prismatic bodies

Full-tensor gravity gradient eigenvector analysis for locating complex geological source positions

Multiphase mafic dykes in the Caledonides of northern Finnmark revealed by a new high-resolution aeromagnetic dataset

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